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The Prime Number Spiral (a.k.a. the Ulam Spiral) is formed by marking the prime numbers in a spiral arrangement of the natural numbers. This is software is for exploring the Prime Number Spiral.
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A program to search for eclipses (lunar, solar, total, annual and umbral), to calculate the phase of the Moon at any given date and time and to convert between dates in the Gregorian and Julian calendars and dates in various lunar calendars (Goddess, Meyer-Palmen and Liberalia Triday).
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This program acts on an HTML document, counting the number of occurrences of words and how they are used, and produces an appropriate keywords meta tag for the document. It ignores common words such as 'this' and the resulting keywords meta tag depends on user-specified weights assigned to boldface words, words within headings, etc. It can be used with documents which use cascading style sheets or which have lots of embedded javascript.
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Hermetic Stego allows you to encrypt and hide a file of any size in one or more BMP image files, with or without the use of a user-specified stego key, so that the presence of the hidden file is undetectable , even by forensic software using statistical methods and if a user-specified stego key is used then the hidden file can be extracted only by someone, using this software, who knows that stego key.
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Software for exploring five cellular automata: q-state Life (a generalization of Conway's Game of Life), the Belousov-Zhabotinsky Reaction, Togetherness, Viral Replication and Diffusion-Limited Aggregation. The documentation provides a complete description of the algorithms used.
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A program to find all factors of any positive integer less than 2^31 - 2, to decompose numbers into their prime constituents, to find prime numbers and pairs of primes, and to plot Erdos-Kac and Palmen Color histograms.
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Easy HTML Construction Kit (six tools in one program) provides an easy way to convert lists and tables in text form to HTML code, and to convert textfiles to full HTML documents. Includes a versatile interactive TABLE creator which supports all TABLE options including ROWSPAN and COLSPAN.
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For converting between BMP, GIF, JPG and PNG graphics files. Has two modes of operation: (i) A single file can be converted to all other formats (except GIF) in one operation. (ii) In batch mode any number of files in a folder can be converted from one format to another (except GIF). In single-file conversion JPGs can be output over a range of quality (compression) values. Converted files can be displayed automatically in the default browser.
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Does date arithmetic (adds a number of days to a date and calculates the number of days between two dates) and converts among Gregorian dates, Julian dates, Annus Novus dates, Julian day numbers and day-in-year dates of the form yyyyddd. Designed for easy performance of date calculations. Program is trilingual: English, German and Spanish.
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A program for secure file deletion which destroys (or purges, by overwriting) data in files on floppy, ZIP or hard disk so that the data cannot be recovered. A single file can be purged or, in batch mode, multiple files (in multiple folders) can be purged in one operation. Allows user-specifiable type of purge. Program can also purge unused clusters or all data on a disk. Purge speed can be tested for accurate estimation of purge times.
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